Derrick.



No. 870,922. PATENTED NOV. 12, 1907. J. S. ALLEN, JR. DERRICK.

APPLICATION FILED JULY 13, 1907.

2 SHEETS--SHBET 1.

No. 870,922. PATLNTLD Nov. 12., 1907. J. s. lALLEN, JL.

DERRICK.

APPLICATION FILED JULY 1s, 1007.

2 SHEETS-SHEET 2 l. fn sf .THE NaRRIs PETERS cn.. wAsH1Nc1aN,v. c.

JACOB S. ALLEN, JR., OF PHILADELPHIA, PENNSYLVANIA.

DERRICK.

Specification or" Letters Patent.

Patented Nov. 12, 1907'.

Application filed July 13. 1907. Serial No. 383,601.

To all whom it may concern:

Be it known that I, Jacon S. ALLEN, Jr., a citizen oi the United States, residing in Philadelphia, Pennsyl-A vania, have invented certain Improvements in Derricks, of which the following is a specification.

My invention relates to derricks, and consists oi certain improvements in structures ol the character shown and described in the patent oi James L. Parsons, No. 785,518, dated March 2l, 1905; the object of my present invention being to simplify the construction of the derrick shown therein; to provide means [or readily operating the same, and to increase its strength and stability.

My invention is ully shown in the accompanying drawings, in which:

Figure 1, is a side elevation of the improved derricl: made in accordance with my invention; Fig. 2, is a plan View of the same; showing the mast in section; Fig. 3, is a sectional elevation oi the tower portion of the structure, taken on the line a-a, Fig. 2; Fig. 4, is an enlarged plan view of the tower, showing the mast of the structure in section on the line b-b, Fig. l; Fig. 5, is an enlarged elevation oi the top oi the tower; Fig. 6, is a sectional view oi the main boom, showing the manner oi securing and bracing the channel sections forming the same, taken on the line c-c, Fig. 2; Fig. 7, is a plan view of the bull wheel on an enlarged scale; Fig. 8, isa side elevation of the bull wheel, and Fig. 9, is a sectional view showing a modified form of boom and carrier.

The tower is indicated at 1, and in the main is oi ordinary construction; being made of structural metal suitably `braced and supported, and having at the top a lat plate 2 upon which is mounted a series ol arms 3, having yokes 4 in which are j ournaled rollers 5.

The mast is indicated at G, and is made of channel sections 7, between which is placed a plate 8 secured to said channels by the angle sections 9. The mast carries a thrust bearing wheel l1 made up of sections 12 secured together, which wheel is disposed on top of the tower so that the rollers 5 bear against the flange oi same; thus affording a means of readily turning said mast, without friction, with respect to said tower.

The main boom is indicated at 13 and is continued rearwardly to form a counterbalance structure 11i. The main boom is braced from the mast head by the tie rods 15, having turn-buckles 16 to take up any slack, and the rear structure is braced by tie rods 17, having similar tulnbuckles. As is clearly illustrated in Fig. 1, the main boom has its outer end elevated; the amount of actual elevation being 3 percent and this is desirable in order that the carrier 18 traveling on said boom, and clearly illustrated 1n Fig. 6, can return toward the tower by gravity. The front and rear sections of the boom are further braced by rods 20 extending troni the ends of the same to cross pieces 2l mounted on the boom adjacent the mast.

The mast (i is stepped into a suitable shoe 22 disposed, in the present instance, on angle cross-pieces 23 substantially in the center ol the tower, and to iurther brace the tower structure and insure the stability of the same when the boom is disposed in any position with respect to said tower, I provide diagonal struts 24 extending from said shoe, above and below the same, to the corner angles ol the tower; such arrangement of the structure boing clearly shown in Fig. 3. The upper corners of the tower are provided with suitable clevises 25 whereby guy ropes may be attached. The bull wheel 2G is carried by the boom and mast directly over the tower, and a line 27 leading to a suitable source ot' power whereby said boom may be moved, passes around the same. Said bull wheel comprises a flanged rim 28 connected together by angle members 29 which cross the same and lie adjacent to the channel members 7 [o1-ming the mast.

The boom as shown in Figs. l and 2, is made of two sections of channel iron, suitably stayed at various points by means o f blocks 30 substantially oi the character shown in Fig. 6, and such blocks are placed throughout the length ol the same. rlhe top of the mast is provided with suitable angle pieces 3l to which the brace rods are attached. I may, however, employ an I-beam 32 or said boom, ol which I have shown a sectional View in Fig. 9. li such structure is employed it will be suitably strengthened by tie rods and braces. For use with such a boom the carrier will be slightly different, as shown at lSL in Fig. 9. At the end of the main boom is a sheave 33 over which the carrier rope 311 passes to the carrier 18, and thence back over another sheave 35 disposed on one side oi the mast, as clearly shown in Figs. l and 7; being carried by a spindle or shalt 3G journaled in bearings 37 on the cross braces oi the bull wheel. The hoisting rope 37 is connected to the carrier at 3S and from the block 39 it passes back over a sheave l0 mounted on the shaft or spindle 3G alongside the sheave 35. By having roller bearings l'or the thrust bearing ring or wheel ll of the mast, I am enabled to turn the mast and boom very readily, and by having the diagonally disposed cross struts 24 within the tower for said mast, the stability of the structure is assured.

l claim:

1. The combination, in a dori-ick, of a tower, a mast stepped in said tower, a boom carried by said mast and having its outer end raised above the horizontal, a thrust bearing ring carried by said mast, and anti-friction rollers therefor carried by the tower.

2. lhe combination, in a del-rick, of a tower, a mast stepped in the same, a shoe for .said mast, and cross struts at the angles of said tower extending to said shoe.

The combination, in a der-rick, of a tower, a mast made of channel sections connected by a iat web stepped in the saine, a shoe for said mast, cross struts at the ang'les of said tower extending to said shoe, a bearing ring for said mast, and anti-friction rollers therefor.

4. The combination, in a derricli, of a tower, a plate carried by the top of the same, a mast stepped in said tower, a bearing wheel carried by said mast, and rollers for engagement with said bearing wheel carried by said plate.

v5. The combination, in a dei-rick, of a tower, a plate carried by the top of the same, a mast stepped in said tower, a thrust bearing wheel carried by said mast, journal carrying arms carried by said plate, and rollers for engagement with said wheel carried by said arms.

6. The combination, in a derrick, of a tower, `a mast stepped therein, said mast comprising channel sections and a dat sheet secured to said channel sections by angle pieces, a boom carried by said mast, and tension rods secured to the headV of said mast and said boom.

7. The combination, in a derrick, of a tower, a mast stepped therein, said mast comprising channel sections and a ilat sheet secured to said channel sections by angle pieces, front and rear booms carried by said mast, and

'tension rods secured to the head of said mast and said boom, the front boom having its outer end disposed above the horizontal.

8. The combination, in a derrick, of a tower, a mast stepped in said tower, a thrust bearing wheel carried by said mast, and antifiiction rollers for said wheel carried by the tower.

9. The combination, in a derrick, of a tower, a mast stepped in the same, a shoe for said mast, and cross struts above and below said shoe and extending from the sameI to the angles of said tower.

10. The combination, in a derrick, of a tower, a mast of structural metal sections stepped in said tower, a sectional bull wheel carried by said mast, a sectional thrust bearing wheel carried by the mast below said bull wheel, and rollers carried by the tower for engagement with said wheel.

11. The combination with the tower of a derrick, of a mast stepped therein and supporting a boom, said mast comprising a plurality of channel sections and a at plate disposed between and secured to the same and lying at right angles to the web of the channelnsections.

12. The combination with the tower of a derrick, of a mast stepped therein and supporting a boom, said mast comprising a plurality of channel sections and a dat plate tapering from the center towards its ends disposed between and secured to said channel sections and lying at right angles to the web of the same.

13. The. combination with the tower of a del-rick, of a mast stepped in the same and supporting a boom, said mast comprising` a plurality of channel sections and a flat plate disposed between and secured to said sections, said flat plate being in line with the boom and serving to resist compressive stress due to the load carried by the boom.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

JACOB S. ALLEN, JR.

Witnesses 2 v MURRAY C. BOYER, Jos. H. KLEIN. 

